mirror of
https://github.com/puppeteer/puppeteer
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73 lines
2.2 KiB
JavaScript
73 lines
2.2 KiB
JavaScript
/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const {helper, assert} = require('./helper');
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class Tracing {
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/**
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* @param {!Puppeteer.CDPSession} client
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*/
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constructor(client) {
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this._client = client;
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this._recording = false;
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this._path = '';
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}
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/**
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* @param {!{path?: string, screenshots?: boolean, categories?: !Array<string>}} options
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*/
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async start(options = {}) {
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assert(!this._recording, 'Cannot start recording trace while already recording trace.');
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const defaultCategories = [
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'-*', 'devtools.timeline', 'v8.execute', 'disabled-by-default-devtools.timeline',
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'disabled-by-default-devtools.timeline.frame', 'toplevel',
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'blink.console', 'blink.user_timing', 'latencyInfo', 'disabled-by-default-devtools.timeline.stack',
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'disabled-by-default-v8.cpu_profiler', 'disabled-by-default-v8.cpu_profiler.hires'
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];
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const {
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path = null,
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screenshots = false,
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categories = defaultCategories,
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} = options;
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if (screenshots)
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categories.push('disabled-by-default-devtools.screenshot');
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this._path = path;
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this._recording = true;
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await this._client.send('Tracing.start', {
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transferMode: 'ReturnAsStream',
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categories: categories.join(',')
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});
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}
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/**
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* @return {!Promise<!Buffer>}
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*/
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async stop() {
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let fulfill;
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const contentPromise = new Promise(x => fulfill = x);
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this._client.once('Tracing.tracingComplete', event => {
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helper.readProtocolStream(this._client, event.stream, this._path).then(fulfill);
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});
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await this._client.send('Tracing.end');
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this._recording = false;
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return contentPromise;
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}
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}
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module.exports = Tracing;
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